mysql更新查询不会执行

i have two update queries to update mysql db of the system.problem is my second update query works but my first one doesn't execute at all. cant figure out whats going on...any help would be great here is my php code.

$dob = $_POST["dob"];
$name = $_POST["name"];
$mob = $_POST["mobileNo"];
$home = $_POST["homeNO"];
$files = $_FILES["filep"]["name"];

echo $files;
$folder = "images/";

$uid = $_SESSION["Uid"];


if($_FILES["filep"]["error"] == 4) {
    echo "no file selected";
}

move_uploaded_file($_FILES["filep"]["tmp_name"] , "$folder".$_FILES["filep"]["name"]);


$result = mysqli_query($con,"UPDATE User SET  DOB = '" . $uid . "', MOBNO = '" . $mob . "', HOMENO = '" . $home . "',DOB = '" . $dob . "',IMAGE_URL = '" . $files . "'   WHERE UID='" . $uid . "'");

$result = mysqli_query($con,"UPDATE User_Credentials SET  NAME = '" . $name . "' WHERE CID='" . $uid . "'");

i have checked all the $name,$mob etc variables and value are passing without any problem..